gcc常用的编译选项对代码的影响.doc

gcc常用的编译选项对代码的影响 原始文档：/articles/200112/320.html 创建时间：2001-12-21 浏览次数：78 原创：alert7 (sztcww_at_) 来源：/ gcc常用的编译选项对代码的影响by alert72001-12-21测试环境 redhat 6.2★ 前言本文讨论gcc的一些常用编译选项对代码的影响。当然代码变了，它的内存布局也就会变了，随之exploit也就要做相应的变动。gcc的编译选项实在太多，本文检了几个最常用的选项。★ 演示程序[alert7@redhat62 alert7]$ cat test.c#include stdio.hvoid hi(void){printf(hi);}int main(int argc, char *argv[]){????????hi();????????return 0;}★ 一般情况[alert7@redhat62 alert7]$ gcc -o test test.c[alert7@redhat62 alert7]$ wc -c test??11773 test[alert7@redhat62 alert7]$ gdb -q test(gdb) disass mainDump of assembler code for function main:0x80483e4 main:?????? push?? %ebp0x80483e5 main+1:???? mov????%esp,%ebp0x80483e7 main+3:???? call?? 0x80483d0 hi0x80483ec main+8:???? xor????%eax,%eax0x80483ee main+10:????jmp????0x80483f0 main+120x80483f0 main+12:????leave0x80483f1 main+13:????ret....End of assembler dump.(gdb) disass hiDump of assembler code for function hi:0x80483d0 hi:????????push?? %ebp0x80483d1 hi+1:?????? mov????%esp,%ebp0x80483d3 hi+3:?????? push?? $0x80484500x80483d8 hi+8:?????? call?? 0x8048308 printf0x80483dd hi+13:??????add????$0x4,%esp0x80483e0 hi+16:??????leave0x80483e1 hi+17:??????ret0x80483e2 hi+18:??????mov????%esi,%esiEnd of assembler dump.来看看部分的内存映象?????????????????? (内存高址)??????????????????????????????+--------+??????????????????????????????|bffffbc4| argv的地址(即argv[0]的地址)?????????????????? 0xbffffb84 +--------+?????????????????????????????? argc的值?????????????????? 0xbffffb80 +--------+??????????????????????????????|400309cb|main的返回地址?????????????????? 0xbffffb7c +--------+ -- 调用main函数前的esp??????????????????????????????|bffffb98| 调用main函数前的ebp?????????????????? 0xbffffb78 +--------+ -- main函数的ebp??????????????????????????????|080483ec| hi()的返回地址?????????????????? 0xbffffb74 +--------+??????????????????????????????|bffffb78| 调用hi()前的esp?????????????????? 0xbffffb70 +--------+ ?????????????????????????????? hi